CN104215841A - Island detection method, island detection device, converter and distributed power generation system - Google Patents
Island detection method, island detection device, converter and distributed power generation system Download PDFInfo
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Abstract
The invention discloses an island detection method. The island detection method includes: performing clark and park transformation on an instantaneous value of voltage at a point of common coupling to obtain components Vdx and Vqx under a rotary dq coordinate system, subjecting the Vdx and Vqx to period averaging to obtain component values Vd and Vq of voltage fundamental wave vectors at the point of common coupling, and finally acquiring voltage fundamental wave amplitude V at the point of common coupling. By utilizing the voltage fundamental wave amplitude at the point of public coupling as a criterion, harmonic components in the voltage at the point of common coupling are eliminated, interference caused by integer harmonics of the voltage at the point of common coupling to judgment of island effect is avoided, and accordingly occurrence of the island effect can be judged rapidly and accurately. Occurrence of the island effect can be judged if any one of the voltage and frequency is beyond a set range, and accuracy is higher. The invention further discloses an island detection device, a grid-connected converter and a distributed power generation system.
Description
Technical field
The application relates to the technical field of generating electricity by way of merging two or more grid systems, and relates in particular to a kind of island detection method, device, current transformer and distributed generation system.
Background technology
Please refer to the schematic diagram that Fig. 1 provides, existing three-phase power supply system comprise grid-connected converter 240, for grid-connected converter 240 provide electric energy input source 250, be connected to the grid-connected switch 210 between grid-connected converter 240 outgoing sides and electrical network 200, the points of common connection 220 between grid-connected converter 240 and grid-connected switch 210 and the load 230 that is connected to points of common connection 220 places.Load 230 had both comprised actual power consumption load, also comprised other grid-connected converter or other equipment (not shown)s of generating electricity by way of merging two or more grid systems.When electrical network, because during failure and other reasons interruption of power supply, grid-connected switch 210 can disconnect, and input source 250, grid-connected converter 240, load 230 just likely form an isolated island with electrical network disconnection.If also there is grid-connected converter or other equipment that generates electricity by way of merging two or more grid systems in electric power system, just likely cause the damage of equipment and threaten staff's personal safety, therefore when occurring, island state must be able to detect rapidly.
Traditional isolated island detection means is divided into passive type and active two kinds.It is mainly that certain check point in electric power system is carried out to status monitoring that passive type detects.Points of common connection while utilizing grid cut-off (Point of Common Coupling, hereinafter referred PCC) is located the variation of voltage or frequency and is carried out island effect judgement.
The conventional method that the variation of PCC place voltage detects island effect while utilizing grid cut-off is detection points of common connection place voltage peak, the points of common connection place voltage peak that utilization detects and the comparison of predeterminated voltage scope, if the points of common connection place voltage peak detecting exceeds predeterminated voltage scope, judge island effect.
But said method exists such problem, that is, when points of common connection place voltage exists integral frequency harmonizing wave, harmonic voltage can make points of common connection place voltage peak increase, thereby causes erroneous judgement.
Summary of the invention
In view of this, the application's object is to provide a kind of island detection method, device, current transformer and distributed generation system, makes it possible to judge fast and accurately the generation of island effect.
For achieving the above object, the application provides following technical scheme:
The application provides a kind of island detection method, and described method comprises:
Obtain component value Vd and the Vq of points of common connection place voltage fundamental vector under rotation dq coordinate system;
Obtain the electric voltage frequency f of points of common connection place;
Component value Vd and Vq according to described points of common connection place voltage fundamental vector under rotation dq coordinate system calculate the voltage fundamental amplitude V of points of common connection place;
If the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope, or if the electric voltage frequency f of described points of common connection place exceeds setpoint frequency scope, there is isolated island in judgement.
Further, if the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope and the duration surpasses default duration, or if described points of common connection place electric voltage frequency exceeds setpoint frequency scope and the duration surpasses default duration, there is isolated island in judgement.
Further, described in, obtaining component value Vd and the Vq of points of common connection place voltage fundamental vector under rotation dq coordinate system comprises:
Obtain the instantaneous voltage Va of points of common connection place, Vb, Vc;
Described points of common connection place instantaneous voltage is carried out to clark conversion and park converts component Vdx and the Vqx that obtains rotating three-phase synthesized voltage vector under dq coordinate system;
According to component Vdx and the Vqx of three-phase synthesized voltage vector under described rotation dq coordinate system, calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq.
Further, described component Vdx and Vqx according to three-phase synthesized voltage vector under described rotation dq coordinate system calculates the voltage fundamental vector component value Vd of described points of common connection place and Vq, comprise component Vdx and the Vqx cycle of carrying out respectively of three-phase synthesized voltage vector under rotation dq coordinate system are on average obtained to the voltage fundamental vector component value Vd of described points of common connection place and Vq,
The application also provides a kind of isolated island detecting device, and described isolated island detecting device comprises:
The first voltage acquiring unit, is used for obtaining component value Vd and the Vq of points of common connection place voltage fundamental vector under rotation dq coordinate system;
Second voltage acquiring unit, the points of common connection place voltage fundamental vector that is used for obtaining according to described the first voltage acquiring unit calculates the voltage fundamental amplitude V of points of common connection place at the component value Vd and the Vq that rotate under dq coordinate system;
Voltage judging unit, described voltage judging unit is used for judging when the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope isolated island occurs.
Further, described isolated island detecting device also comprises: frequency acquisition unit, is used for obtaining the electric voltage frequency f of points of common connection place; Frequency judging unit, described frequency judging unit is used for judging when the frequency of described points of common connection place voltage exceeds setpoint frequency scope isolated island occurs.
Further, described voltage judging unit be used for when the voltage fundamental amplitude V of described points of common connection place exceed setting voltage scope and duration while surpassing default duration judgement there is isolated island; The frequency that described frequency judging unit is used for when described points of common connection place voltage exceed setpoint frequency scope and duration while surpassing default duration judgement there is isolated island.
Further, described the first voltage acquiring unit comprises:
Instantaneous voltage acquisition module, is used for obtaining points of common connection place instantaneous voltage;
The component acquisition module of voltage vector, the points of common connection place instantaneous voltage that is used for that instantaneous voltage acquisition module is obtained carries out clark conversion and park converts component Vdx and the Vqx that obtains rotating three-phase synthesized voltage vector under dq coordinate system;
Voltage fundamental vector component value acquisition module, under the rotation dq coordinate system that is used for obtaining according to the component acquisition module of voltage vector, the component Vdx of three-phase synthesized voltage vector and Vqx calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq.
The application also provides a kind of grid-connected converter, and described grid-connected converter comprises above-mentioned isolated island detecting device.
The application also provides a kind of distributed generation system, and described distributed generation system comprises above-mentioned isolated island detecting device, or described distributed generation system comprises above-mentioned grid-connected converter.
From above-mentioned technical scheme, can find out, the application obtains rotating component Vdx and the Vqx under dq coordinate system by points of common connection place instantaneous voltage being carried out to clark and park conversion, and it is average that Vdx and Vqx are carried out to the cycle, obtain the voltage fundamental vector component value Vd of points of common connection place and Vq, the final voltage fundamental amplitude V of points of common connection place that obtains, utilize points of common connection place voltage fundamental amplitude as criterion, eliminated the harmonic component in points of common connection place voltage, the interference of having avoided points of common connection place voltage integral frequency harmonizing wave to cause the judgement of island effect, thereby can be quick, judge accurately the generation of island effect.Adopt the application's scheme, in voltage and frequency, any surpasses setting range, all can judge the generation of island effect, and accuracy is higher.And, the island effect detection scheme that the application provides, simple, do not need extra hardware, do not increase cost, can not affect the electrical network quality of power supply and system effectiveness yet, be a kind of not only economy but also practical scheme.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of prior art electric power system;
The process flow diagram of the island detection method embodiment mono-that Fig. 2 provides for the application;
The process flow diagram of the island detection method embodiment bis-that Fig. 3 provides for the application;
The process flow diagram of the island detection method embodiment tri-that Fig. 4 provides for the application;
The structural drawing of the isolated island detecting device embodiment mono-that Fig. 5 provides for the application;
The structural drawing of the isolated island detecting device embodiment bis-that Fig. 6 provides for the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
The embodiment of the present application discloses a kind of island detection method, pick-up unit, grid-connected converter and distributed generation system, makes it possible to judge fast and accurately the generation of island effect.
Please refer to Fig. 2, the island detection method embodiment mono-that the application provides comprises the steps:
S101: obtain the voltage fundamental vector component value Vd of points of common connection place and Vq;
S102: calculate the voltage fundamental amplitude V of points of common connection place according to the voltage fundamental vector component value Vd of described points of common connection place and Vq;
S103: obtain the electric voltage frequency f of points of common connection place;
S104: if the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope or described points of common connection place electric voltage frequency exceeds setpoint frequency scope, isolated island occurs in judgement;
It should be noted that, step S103 can also carry out before step S101, also can before step S102, carry out.
Setting voltage scope and setpoint frequency scope are by various countries or regional standard and design in conjunction with actual conditions.For example setting voltage scope can be ± 15% electrical network rated voltage, and setpoint frequency scope can be ± 1% electrical network rated frequency.
Obtaining of the electric voltage frequency f of points of common connection place can be caught and obtain points of common connection place voltage over zero by the trapping module unit of microprocessor, or calculates by phaselocked loop.
Owing to utilizing points of common connection place voltage fundamental amplitude as criterion, can eliminate the harmonic component in points of common connection place voltage, the interference of having avoided points of common connection place voltage integral frequency harmonizing wave to cause the judgement of island effect, thus can judge fast and accurately the generation of island effect.And, the scheme of employing the embodiment of the present application, in voltage and frequency, any surpasses setting range, all can judge the generation of island effect, and accuracy is higher.
Further, refer to Fig. 3, the island detection method embodiment bis-providing for the application, if the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope and the duration surpasses default duration, or, if described points of common connection place electric voltage frequency exceeds setpoint frequency scope and the duration surpasses default duration, there is isolated island in judgement.
Default duration should be less than the island effect detection time of the regulations such as various countries or each department technical standard or industry standard, can set flexibly according to actual conditions, meet the demands, for example, standard regulation detects island effect in 2 seconds and occurs, and so default duration can be 1.5 seconds.
By increasing default duration, eliminated the interference in deterministic process, in order to avoid erroneous judgement is disconnected.
The island detection method embodiment tri-that Fig. 4 provides for the application, further, described in obtain the voltage fundamental vector component value Vd of points of common connection place and Vq comprises the steps:
S201: obtain the instantaneous voltage Va of points of common connection place, Vb, Vc;
S202: the instantaneous voltage Va of described points of common connection place, Vb, Vc are carried out to component Vdx and the Vqx that Clark conversion and Park conversion obtains rotating three-phase synthesized voltage vector under dq coordinate system;
S203: calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq according to component Vdx and the Vqx of three-phase synthesized voltage vector under described rotation dq coordinate system.
Further, Clark transformation calculations formula is as follows:
Park transformation calculations formula is as follows:
Wherein, θ is the anglec of rotation.
Further, according to component Vdx and the Vqx of three-phase synthesized voltage vector under described rotation dq coordinate system, calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq, be specially: the component Vdx of three-phase synthesized voltage vector under rotation dq coordinate system and Vqx are carried out to the cycle average, n is positive integer, that is:
According to the voltage fundamental vector component value Vd of points of common connection place and Vq, utilize formula
obtain the voltage fundamental amplitude V of points of common connection place.
It should be noted that, the instantaneous voltage Va of points of common connection place, Vb, Vc detect at points of common connection place, when electrical network is three-phase system, the instantaneous voltage Va of points of common connection place, Vb, Vc are respectively voltage (referring to Fig. 1) on A, B, C three-phase, can obtain by voltage measurement instruments such as voltage sensors, by Va, Vb, Vc substitution formula one, through clark, conversion obtains component V under two-phase rest frame
α, V
β, then through park, convert component Vdx and the Vqx that obtains three-phase synthesized voltage vector; When electrical network is monophase system (not shown), by monophase system points of common connection place's voltage and the 90 ° of voltage substitution formula two that lag behind thereof, through park, conversion obtains component Vdx and the Vqx of three-phase synthesized voltage vector.
In formula two
ω is electrical network angular frequency, ω=2 π f, and obtaining of frequency f can be caught and obtain or calculate by phaselocked loop, θ points of common connection place voltage over zero by the trapping module unit of microprocessor
0for initial given phase angle.
Formula three shows: the voltage fundamental vector component value Vd of points of common connection place and Vq on average obtained by component Vdx and the Vqx cycle of carrying out under rotation dq coordinate system, owing to conventionally containing a large amount of low-order harmonics and a small amount of higher hamonic wave in actual electric network, make the voltage at points of common connection place also contain a large amount of low-order harmonics and a small amount of higher harmonic components, for the variation of points of common connection place voltage before and after utility electric network fault judges the accuracy of island effect, the application has adopted the digital filtering mode of mean filter, first points of common connection place instantaneous voltage is carried out to clark and park conversion, after conversion, electrical network fundametal compoment is transformed to DC component, harmonic component is transformed to sinusoidal component K-1 time, wherein K is overtone order.Vdx and Vqx are carried out to the cycle average, most low orders and higher hamonic wave in can filtering voltage.
The embodiment of the present application obtains rotating component Vdx and the Vqx under dq coordinate system by points of common connection place instantaneous voltage being carried out to clark and park conversion, and it is average that Vdx and Vqx are carried out to the cycle, obtain the voltage fundamental vector component value Vd of points of common connection place and Vq, the final voltage fundamental amplitude V of points of common connection place that obtains, utilize points of common connection place voltage fundamental amplitude as criterion, eliminated the harmonic component in points of common connection place voltage, the interference of having avoided points of common connection place voltage integral frequency harmonizing wave to cause the judgement of island effect, thereby can be quick, judge accurately the generation of island effect.And, the island effect detection scheme that the application provides, simple, do not need extra hardware, do not increase cost, can not affect the electrical network quality of power supply and system effectiveness yet, be a kind of not only economy but also practical scheme.
With above-described embodiment accordingly, the application also provides isolated island detecting device embodiment, please refer to Fig. 5, the isolated island detecting device embodiment mono-that the application provides, isolated island detecting device comprises:
The first voltage acquiring unit 101, is used for obtaining the voltage fundamental vector component value Vd of points of common connection place and Vq;
Second voltage acquiring unit 102, the voltage fundamental vector component value Vd of points of common connection place and the Vq that are used for obtaining according to described the first voltage acquiring unit calculate the voltage fundamental amplitude V of points of common connection place;
Voltage judging unit 104, described voltage judging unit is used for judging when the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope isolated island occurs.
Further, described isolated island detecting device also comprises frequency acquisition unit 103, is used for obtaining points of common connection place electric voltage frequency; And frequency judging unit 105, described frequency judging unit is used for judging when the frequency of described points of common connection place voltage exceeds setpoint frequency scope isolated island occurs.
Further, described voltage judging unit be used for when the voltage fundamental amplitude V of described points of common connection place exceed setting voltage scope and duration while surpassing default duration judgement there is isolated island; Or, the frequency that described frequency judging unit is used for when described points of common connection place voltage exceed setpoint frequency scope and duration while surpassing default duration judgement there is isolated island.
The isolated island detecting device embodiment bis-that Fig. 6 provides for the application, further, described the first voltage acquisition device comprises:
Instantaneous voltage acquisition module 1011, is used for obtaining the instantaneous voltage Va of points of common connection place, Vb, Vc;
The component acquisition module 1012 of voltage vector, the points of common connection place instantaneous voltage that is used for that instantaneous voltage acquisition module is obtained carries out clark conversion and park converts component Vdx and the Vqx that obtains rotating three-phase synthesized voltage vector under dq coordinate system;
Voltage fundamental vector component value acquisition module 1013, under the rotation dq coordinate system that is used for obtaining according to the component acquisition module of voltage vector, the component Vdx of three-phase synthesized voltage vector and Vqx calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq.
Particularly,
Clark transformation calculations formula is as follows:
Park transformation calculations formula is as follows:
Further, the computing formula of the voltage fundamental vector component value Vd of described points of common connection place and Vq is as follows:
According to the voltage fundamental vector component value Vd of points of common connection place and Vq, utilize formula
obtain the voltage fundamental amplitude V of points of common connection place.
The voltage fundamental vector component value Vd of points of common connection place and Vq on average obtained by component Vdx and the Vqx cycle of carrying out under rotation dq coordinate system, owing to conventionally containing a large amount of low-order harmonics and a small amount of higher hamonic wave in actual electric network, make the voltage at points of common connection place also contain a large amount of low-order harmonics and a small amount of higher harmonic components, for the variation of points of common connection place voltage before and after utility electric network fault judges the accuracy of island effect, the application has adopted the digital filtering mode of mean filter, first points of common connection place instantaneous voltage is carried out to clark and park conversion, after conversion, electrical network fundametal compoment is transformed to DC component, harmonic component is transformed to sinusoidal component K-1 time, wherein K is overtone order.Vdx and Vqx are carried out to the cycle average, most low orders and higher hamonic wave in can filtering voltage.
The application also provides a kind of grid-connected converter, comprises the isolated island detecting device described in above-described embodiment.That is to say, isolated island detecting device both can independently become a device, also can be used as parts of grid-connected converter.
The application also provides a kind of distributed generation system, comprises the isolated island detecting device described in above-described embodiment or comprises the grid-connected converter that is integrated with isolated island detecting device described in above-described embodiment.
The embodiment of the present application obtains rotating component Vdx and the Vqx under dq coordinate system by points of common connection place instantaneous voltage being carried out to clark and park conversion, and it is average that Vdx and Vqx are carried out to the cycle, obtain the voltage fundamental vector component value Vd of points of common connection place and Vq, the final voltage fundamental amplitude V of points of common connection place that obtains, utilize points of common connection place voltage fundamental amplitude as criterion, eliminated the harmonic component in points of common connection place voltage, the interference of having avoided points of common connection place voltage integral frequency harmonizing wave to cause the judgement of island effect, thereby can be quick, judge accurately the generation of island effect.Adopt the scheme of the embodiment of the present application, in voltage and frequency, any surpasses setting range, all can judge the generation of island effect, and accuracy is higher.And, the island effect detection scheme that the application provides, simple, do not need extra hardware, do not increase cost, can not affect the electrical network quality of power supply and system effectiveness yet, be a kind of not only economy but also practical scheme.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, described program, when carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the application.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can be in the situation that do not depart from the application's spirit or scope, realization in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. an island detection method, is characterized in that, described method comprises:
Obtain component value Vd and the Vq of points of common connection place voltage fundamental vector under rotation dq coordinate system;
Obtain the electric voltage frequency f of points of common connection place;
Component value Vd and Vq according to described points of common connection place voltage fundamental vector under rotation dq coordinate system calculate the voltage fundamental amplitude V of points of common connection place;
If the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope, or if the electric voltage frequency f of described points of common connection place exceeds setpoint frequency scope, there is isolated island in judgement.
2. method according to claim 1, is characterized in that,
If the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope and the duration surpasses default duration, or if described points of common connection place electric voltage frequency exceeds setpoint frequency scope and the duration surpasses default duration, there is isolated island in judgement.
3. method according to claim 1 and 2, is characterized in that, described in obtain component value Vd and the Vq of points of common connection place voltage fundamental vector under rotation dq coordinate system and comprise:
Obtain the instantaneous voltage Va of points of common connection place, Vb, Vc;
Described points of common connection place instantaneous voltage is carried out to clark conversion and park converts component Vdx and the Vqx that obtains rotating three-phase synthesized voltage vector under dq coordinate system;
According to component Vdx and the Vqx of three-phase synthesized voltage vector under described rotation dq coordinate system, calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq.
4. method according to claim 3, it is characterized in that, described component Vdx and Vqx according to three-phase synthesized voltage vector under described rotation dq coordinate system calculates the voltage fundamental vector component value Vd of described points of common connection place and Vq, comprise component Vdx and the Vqx cycle of carrying out respectively of three-phase synthesized voltage vector under rotation dq coordinate system are on average obtained to the voltage fundamental vector component value Vd of described points of common connection place and Vq,
wherein n is positive integer.
5. an isolated island detecting device, is characterized in that, described isolated island detecting device comprises:
The first voltage acquiring unit, is used for obtaining component value Vd and the Vq of points of common connection place voltage fundamental vector under rotation dq coordinate system;
Second voltage acquiring unit, the points of common connection place voltage fundamental vector that is used for obtaining according to described the first voltage acquiring unit calculates the voltage fundamental amplitude V of points of common connection place at the component value Vd and the Vq that rotate under dq coordinate system;
Voltage judging unit, described voltage judging unit is used for judging when the voltage fundamental amplitude V of described points of common connection place exceeds setting voltage scope isolated island occurs.
6. device according to claim 5, is characterized in that, described isolated island detecting device also comprises:
Frequency acquisition unit, is used for obtaining the electric voltage frequency f of points of common connection place;
Frequency judging unit, described frequency judging unit is used for judging when the frequency of described points of common connection place voltage exceeds setpoint frequency scope isolated island occurs.
7. device according to claim 6, is characterized in that, described voltage judging unit be used for when the voltage fundamental amplitude V of described points of common connection place exceed setting voltage scope and duration while surpassing default duration judgement there is isolated island; The frequency that described frequency judging unit is used for when described points of common connection place voltage exceed setpoint frequency scope and duration while surpassing default duration judgement there is isolated island.
8. according to the device described in any one in claim 5 to 7, it is characterized in that, described the first voltage acquiring unit comprises:
Instantaneous voltage acquisition module, is used for obtaining points of common connection place instantaneous voltage;
The component acquisition module of voltage vector, the points of common connection place instantaneous voltage that is used for that instantaneous voltage acquisition module is obtained carries out clark conversion and park converts component Vdx and the Vqx that obtains rotating three-phase synthesized voltage vector under dq coordinate system;
Voltage fundamental vector component value acquisition module, under the rotation dq coordinate system that is used for obtaining according to the component acquisition module of voltage vector, the component Vdx of three-phase synthesized voltage vector and Vqx calculate the voltage fundamental vector component value Vd of described points of common connection place and Vq.
9. a grid-connected converter, is characterized in that, described grid-connected converter comprises the isolated island detecting device described in any one in claim 5 to 8.
10. a distributed generation system, is characterized in that, described distributed generation system comprises the isolated island detecting device described in any one in claim 5 to 8, or described distributed generation system comprises grid-connected converter claimed in claim 9.
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| US10637249B2 (en) | 2016-11-24 | 2020-04-28 | Huawei Technologies Co., Ltd. | Inverter anti-islanding control system |
| CN107526009A (en) * | 2017-09-13 | 2017-12-29 | 国电南瑞科技股份有限公司 | It is a kind of that Interlocking Methods are detected according to the isolated island of frequency and curent change sequential |
| CN108983045A (en) * | 2018-08-08 | 2018-12-11 | 江苏固德威电源科技股份有限公司 | A kind of passive type island detection method |
| CN111103484A (en) * | 2019-12-19 | 2020-05-05 | 国网湖南省电力有限公司 | Island detection method, device and system based on hybrid power feedback disturbance |
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